Where's the Free Space?

So, I've been slightly concerned about my lack of space and downloaded "WheresTheFeeSpace" to get an overview of my machine:
Library: 9.44G (12%)
Applications: 9.37G (12%)
Users: 7.23G (9%)
System: 3.19G (4%)
Private: 2.47G (3%)
USR: 914.86M (1%)
Bin: 9.00M (0%)
Sbin: 5.41M (0%)
The rest listed was nominal and 0% but here's the rub -- this program says I am only using 44% of the machine yet I only have 13.72GB left available!
A little over 50% of my machine can't be accessed and I'm clueless where to look for more space!

See what happens if you do this:
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger and Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Then select your hard drive and press COMMAND-I to open the Get Info window. See what space information is being reported.

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